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feat(saolei): 显存扩成每格 2 字节 + 内置 A-Z 字模；开始界面加文字、难度选择和黑背景

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显示（RTL）
- cpu21_vga.v：显存从"每格 1 字节"改成"每格 2 字节"（第 1 字节是 6 位字形、
  第 2 字节是 3 位颜色），字地址由 cidx[10:2] 改为 cidx[10:1]（1 字 = 2 格）；
  字模表由 4 位扩到 6 位（0..63），新增 A-Z 大写字母（16..41），原 0..15 的
  数字/雷/旗/问号/横线/实心字形不变
- cpu21_mmio.v：显存窗口 0x2000-0x27FF -> 0x2000-0x2FFF（300 -> 600 字），
  fb_widx 相应取 addr_i[11:2]
- cpu21_board_top.v：FB_WORDS 300 -> 600（1200 -> 2400 字节）

软件
- mmio.h：fb_write() -> fb_write_cell(idx, glyph, color)（一格写两个 sb）；
  删掉 CELL()，新增 G_A..G_Z 字形常量
- saolei.c：draw_cell / clear_screen 改用 fb_write_cell；开始界面显示
  MINES / EASY / NORMAL / HARD / START 文字（START 直接写在绿色按钮条上），
  不再是"两排雷图案 + 纯色条"
- 难度选择：新增 g_difficulty / g_mines，三档 20 / 40 / 60 雷；place_mines、
  胜利用的 opened_cnt 比较、toggle_flag 的剩余雷数都改读 g_mines；点难度那一行
  即切换并重画菜单，点 START 才把雷数交给关卡
- 全部索引运算仍只用移位/掩码（棋盘固定 16x16），没有引入除法

配色（修"数字 1 看不见"）
- 数字 1 用 C_BLUE、游戏背景原来也是 C_BLUE，调色板里是同一个深蓝，所以数字 1
  完全看不见；现在菜单与关卡背景统一改成 C_BLACK，胜负闪动仍是绿/红/黑，
  数字本身的配色不动

工具与文档
- build.ps1：Python 启动器兼容 —— 有 py 用 py，没有就回退到 python
  （本机只有 python，之前 check_isa.py / elf2hex.py 两处都会中断）
- saolei/README.md：显存表（0x2000-0x2FFF、每格 2 字节）、格子编码（6 位字形、
  16..41 是 A-Z）、难度说明同步更新
- README.md / cpu21_board_top.v：仅格式化工具重排（Markdown 表格对齐、
  if/else 合并成一行），无语义变化

验证：build.ps1 全流程通过（972 条指令 ISA 检查全过；text=3888 B / data=0 /
bss=1444 B；入口 _start=0x0、isr1/2/3=0x100/0x200/0x300）；xvlog 不带宏与带
SAOLEI_ROM 两种配置编译均无错；tools/check_rtl_text.ps1 体检 OK。
未验证：未跑行为仿真、未上板。
This commit is contained in:
Anccend
2026-09-23 19:23:45 +08:00
parent db0a174bb7
commit cfcf2f4923
9 changed files with 2010 additions and 1877 deletions
Download Patch File Download Diff File Expand all files Collapse all files
pipelined-cpu/srcs/rtl/cpu21_vga.v
+264 -174
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@@ -4,7 +4,7 @@
// -----------------------------------------------------------------------------
// cpu21_vga —— 640x480@60 的"格子"显示控制器（显存端口接板级顶层的双口 RAM）。
//
// CPU 不直接操作像素：它只通过 MMIO 往显示缓冲区里写"每格 1 字节"（字形 + 颜色），
// CPU 不直接操作像素：它只通过 MMIO 往显示缓冲区里写"每格 2 字节"（字形 + 颜色），
// 本模块按像素扫描把格子展开成画面（8x8 字模放大 2 倍填满 16x16 的格子）。
// 这样一格只要 1 次字节写，刷屏开销极小。
//
@@ -18,218 +18,308 @@
// （CTRL[0] 控制显示与否）。缓冲区字节的 bit7 在本模块中不使用（保留）。
// -----------------------------------------------------------------------------
module cpu21_vga #(
parameter integer H_VISIBLE = 640,
parameter integer H_FP = 16,
parameter integer H_SYNC = 96,
parameter integer H_BP = 48,
parameter integer V_VISIBLE = 480,
parameter integer V_FP = 10,
parameter integer V_SYNC = 2,
parameter integer V_BP = 33,
parameter integer COLS = 40,
parameter integer ROWS = 30
) (
input wire clk,
input wire reset,
input wire tick, // 25 MHz 像素使能（每 2 个 clk 一拍）
// 显示缓冲区读端口
output wire [ 9:0] fb_raddr_o,
input wire [31:0] fb_word_i,
// 控制
input wire [31:0] ctrl_i,
input wire [31:0] cursor_i,
// VGA 输出
output reg [ 3:0] vga_r,
output reg [ 3:0] vga_g,
output reg [ 3:0] vga_b,
output reg vga_hs,
output reg vga_vs,
output reg frame_tick_o
);
parameter integer H_VISIBLE = 640,
parameter integer H_FP = 16,
parameter integer H_SYNC = 96,
parameter integer H_BP = 48,
parameter integer V_VISIBLE = 480,
parameter integer V_FP = 10,
parameter integer V_SYNC = 2,
parameter integer V_BP = 33,
parameter integer COLS = 40,
parameter integer ROWS = 30
) (
input wire clk,
input wire reset,
input wire tick, // 25 MHz 像素使能（每 2 个 clk 一拍）
// 显示缓冲区读端口
output wire [ 9:0] fb_raddr_o,
input wire [31:0] fb_word_i,
// 控制
input wire [31:0] ctrl_i,
input wire [31:0] cursor_i,
// VGA 输出
output reg [ 3:0] vga_r,
output reg [ 3:0] vga_g,
output reg [ 3:0] vga_b,
output reg vga_hs,
output reg vga_vs,
output reg frame_tick_o
);
localparam integer H_TOTAL = H_VISIBLE + H_FP + H_SYNC + H_BP; // 800
localparam integer V_TOTAL = V_VISIBLE + V_FP + V_SYNC + V_BP; // 525
localparam integer H_TOTAL = H_VISIBLE + H_FP + H_SYNC + H_BP; // 800
localparam integer V_TOTAL = V_VISIBLE + V_FP + V_SYNC + V_BP; // 525
// ---------------------------------------------------------------------------
// 扫描计数
// ---------------------------------------------------------------------------
reg [9:0] hx, vy;
// ---------------------------------------------------------------------------
// 扫描计数
// ---------------------------------------------------------------------------
reg [9:0] hx, vy;
always @(posedge clk or posedge reset) begin
if (reset) begin
hx <= 10'd0;
vy <= 10'd0;
end
else if (tick) begin
if (hx == H_TOTAL - 1) begin
hx <= 10'd0;
vy <= (vy == V_TOTAL - 1) ? 10'd0 : (vy + 10'd1);
end
else begin
hx <= hx + 10'd1;
end
end
always @(posedge clk or posedge reset) begin
if (reset) begin
hx <= 10'd0;
vy <= 10'd0;
end else if (tick) begin
if (hx == H_TOTAL - 1) begin
hx <= 10'd0;
vy <= (vy == V_TOTAL - 1) ? 10'd0 : (vy + 10'd1);
end else begin
hx <= hx + 10'd1;
end
end
end
wire de = (hx < H_VISIBLE) && (vy < V_VISIBLE);
wire de = (hx < H_VISIBLE) && (vy < V_VISIBLE);
// 同步信号在 tick 上寄存输出
wire hs_n = ~((hx >= (H_VISIBLE + H_FP)) && (hx < (H_VISIBLE + H_FP + H_SYNC)));
wire vs_n = ~((vy >= (V_VISIBLE + V_FP)) && (vy < (V_VISIBLE + V_FP + V_SYNC)));
// 同步信号在 tick 上寄存输出
wire hs_n = ~((hx >= (H_VISIBLE + H_FP)) && (hx < (H_VISIBLE + H_FP + H_SYNC)));
wire vs_n = ~((vy >= (V_VISIBLE + V_FP)) && (vy < (V_VISIBLE + V_FP + V_SYNC)));
// ---------------------------------------------------------------------------
// 格子索引与缓冲区读出
// ---------------------------------------------------------------------------
wire [5:0] ccol = hx[9:4]; // 0..39
wire [4:0] crow = vy[8:4]; // 0..29
wire [10:0] cidx = (crow << 5) + (crow << 3) + ccol; // row*40 + col
// ---------------------------------------------------------------------------
// 格子索引与缓冲区读出
// ---------------------------------------------------------------------------
wire [5:0] ccol = hx[9:4]; // 0..39
wire [4:0] crow = vy[8:4]; // 0..29
wire [10:0] cidx = (crow << 5) + (crow << 3) + ccol; // row*40 + col
assign fb_raddr_o = cidx[10:2]; // 字地址（1 字 = 4 格）
assign fb_raddr_o = cidx[10:1]; // 字地址（1 字 = 2 格）
wire [1:0] lane = cidx[1:0];
wire [31:0] cell_word = fb_word_i;
wire [7:0] cell_byte = cell_word >> {lane, 3'b000};
wire [ 1:0] lane = {cidx[0], 1'b0};
wire [ 1:0] color_lane = lane + 2'd1;
wire [31:0] cell_word = fb_word_i;
wire [ 7:0] glyph_byte = cell_word >> {lane, 3'b000};
wire [ 7:0] color_byte = cell_word >> {color_lane, 3'b000};
wire [3:0] glyph = cell_byte[3:0];
wire [2:0] gcolor = cell_byte[6:4];
// 全局背景色（字模点为 0 时显示的颜色）
wire [2:0] bgcolor = ctrl_i[7:4];
wire [ 5:0] glyph = glyph_byte[5:0];
wire [ 2:0] gcolor = color_byte[2:0];
// 全局背景色（字模点为 0 时显示的颜色）
wire [ 2:0] bgcolor = ctrl_i[7:4];
// ---------------------------------------------------------------------------
// 8x8 字模（bit7 = 最左像素），放大 2 倍填满 16x16 的格子
// ---------------------------------------------------------------------------
wire [2:0] fx = hx[3:1];
wire [2:0] fy = vy[3:1];
// ---------------------------------------------------------------------------
// 8x8 字模（bit7 = 最左像素），放大 2 倍填满 16x16 的格子；字形编号 0..63。
// ---------------------------------------------------------------------------
wire [ 2:0] fx = hx[3:1];
wire [ 2:0] fy = vy[3:1];
function [7:0] font_row;
input [3:0] g;
input [2:0] r;
begin
case (g)
4'd0:
font_row = 8'h00; // 空白
4'd1:
font_row = (r == 3'd0) ? 8'h18 : (r == 3'd1) ? 8'h38 : (r == 3'd2) ? 8'h18 :
function [7:0] font_row;
input [5:0] g;
input [2:0] r;
begin
case (g)
6'd0: font_row = 8'h00; // 空白
6'd1:
font_row = (r == 3'd0) ? 8'h18 : (r == 3'd1) ? 8'h38 : (r == 3'd2) ? 8'h18 :
(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h18 :
(r == 3'd6) ? 8'h7E : 8'h00; // 1
4'd2:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h06 :
6'd2:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h06 :
(r == 3'd3) ? 8'h0C : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h30 :
(r == 3'd6) ? 8'h7E : 8'h00; // 2
4'd3:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h06 :
6'd3:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h06 :
(r == 3'd3) ? 8'h1C : (r == 3'd4) ? 8'h06 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h3C : 8'h00; // 3
4'd4:
font_row = (r == 3'd0) ? 8'h0C : (r == 3'd1) ? 8'h1C : (r == 3'd2) ? 8'h3C :
6'd4:
font_row = (r == 3'd0) ? 8'h0C : (r == 3'd1) ? 8'h1C : (r == 3'd2) ? 8'h3C :
(r == 3'd3) ? 8'h6C : (r == 3'd4) ? 8'h7E : (r == 3'd5) ? 8'h0C :
(r == 3'd6) ? 8'h0C : 8'h00; // 4
4'd5:
font_row = (r == 3'd0) ? 8'h7E : (r == 3'd1) ? 8'h60 : (r == 3'd2) ? 8'h7C :
6'd5:
font_row = (r == 3'd0) ? 8'h7E : (r == 3'd1) ? 8'h60 : (r == 3'd2) ? 8'h7C :
(r == 3'd3) ? 8'h06 : (r == 3'd4) ? 8'h06 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h3C : 8'h00; // 5
4'd6:
font_row = (r == 3'd0) ? 8'h1C : (r == 3'd1) ? 8'h30 : (r == 3'd2) ? 8'h60 :
6'd6:
font_row = (r == 3'd0) ? 8'h1C : (r == 3'd1) ? 8'h30 : (r == 3'd2) ? 8'h60 :
(r == 3'd3) ? 8'h7C : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h3C : 8'h00; // 6
4'd7:
font_row = (r == 3'd0) ? 8'h7E : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h0C :
6'd7:
font_row = (r == 3'd0) ? 8'h7E : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h0C :
(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h18 :
(r == 3'd6) ? 8'h18 : 8'h00; // 7
4'd8:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
6'd8:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h3C : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h3C : 8'h00; // 8
4'd9:
font_row = (r == 3'd0) ? 8'hFF : (r == 3'd1) ? 8'h81 : (r == 3'd2) ? 8'hBD :
6'd9:
font_row = (r == 3'd0) ? 8'hFF : (r == 3'd1) ? 8'h81 : (r == 3'd2) ? 8'hBD :
(r == 3'd3) ? 8'hA5 : (r == 3'd4) ? 8'hA5 : (r == 3'd5) ? 8'hBD :
(r == 3'd6) ? 8'h81 : 8'hFF; // 未揭开的方块
4'd10:
font_row = (r == 3'd0) ? 8'h40 : (r == 3'd1) ? 8'h70 : (r == 3'd2) ? 8'h78 :
6'd10:
font_row = (r == 3'd0) ? 8'h40 : (r == 3'd1) ? 8'h70 : (r == 3'd2) ? 8'h78 :
(r == 3'd3) ? 8'h70 : (r == 3'd4) ? 8'h40 : (r == 3'd5) ? 8'h40 :
(r == 3'd6) ? 8'h40 : 8'h00; // 旗
4'd11:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h7E : (r == 3'd2) ? 8'hFF :
6'd11:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h7E : (r == 3'd2) ? 8'hFF :
(r == 3'd3) ? 8'hFF : (r == 3'd4) ? 8'hFF : (r == 3'd5) ? 8'hFF :
(r == 3'd6) ? 8'h7E : 8'h3C; // 雷
4'd12:
font_row = (r == 3'd0) ? 8'h81 : (r == 3'd1) ? 8'h42 : (r == 3'd2) ? 8'h24 :
6'd12:
font_row = (r == 3'd0) ? 8'h81 : (r == 3'd1) ? 8'h42 : (r == 3'd2) ? 8'h24 :
(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h24 :
(r == 3'd6) ? 8'h42 : 8'h81; // 爆炸
4'd13:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h06 :
6'd13:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h06 :
(r == 3'd3) ? 8'h0C : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h00 :
(r == 3'd6) ? 8'h18 : 8'h00; // 问号
4'd14:
font_row = (r == 3'd3) ? 8'hFF : (r == 3'd4) ? 8'hFF : 8'h00; // 横线
4'd15:
font_row = 8'hFF; // 实心
default:
font_row = 8'h00;
endcase
end
endfunction
wire [7:0] frow = font_row(glyph, fy);
wire glyph_px = frow[3'd7 - fx]; // 1 = 画字模点
// ---------------------------------------------------------------------------
// 光标框：黄色、常亮、2 像素宽
// 原来是 1 像素浅灰 + 闪动（blink 周期约 1.3 s）：在白色未揭开格上几乎看不清，
// 而且截图有一半概率正好截到"灭"的那个相位。改成黄色常亮 2 像素后，
// VGA 上和图里都能一眼看到指针。想改回闪动：把 blink_q 加回来，
// 再在 cursor_box 里与上 blink 即可。
// ---------------------------------------------------------------------------
wire cursor_here = (cursor_i[4:0] == ccol) && (cursor_i[12:8] == crow);
wire on_border = (hx[3:0] < 4'd2) || (hx[3:0] > 4'd13) ||
(vy[3:0] < 4'd2) || (vy[3:0] > 4'd13);
wire cursor_box = cursor_here && ctrl_i[0] && on_border;
// ---------------------------------------------------------------------------
// 颜色（3 位调色板 -> 4:4:4 RGB）
// ---------------------------------------------------------------------------
function [11:0] pal;
input [2:0] c;
begin
case (c)
3'd0:
pal = {4'h0, 4'h0, 4'h0}; // 黑
3'd1:
pal = {4'h0, 4'h0, 4'hA}; // 深蓝
3'd2:
pal = {4'h0, 4'hA, 4'h0}; // 绿
3'd3:
pal = {4'h0, 4'hA, 4'hA}; // 青
3'd4:
pal = {4'hA, 4'h0, 4'h0}; // 红
3'd5:
pal = {4'hA, 4'h0, 4'hA}; // 洋红
3'd6:
pal = {4'hA, 4'hA, 4'h0}; // 黄
default:
pal = {4'hA, 4'hA, 4'hA}; // 浅灰
endcase
end
endfunction
wire [2:0] px_color = glyph_px ? gcolor : bgcolor;
wire [2:0] px_final = cursor_box ? 3'd6 : px_color; // 6 = 黄，光标框
wire [11:0] px_rgb = de ? pal(px_final) : 12'h000;
always @(posedge clk or posedge reset) begin
if (reset) begin
{vga_r, vga_g, vga_b} <= 12'h000;
vga_hs <= 1'b1;
vga_vs <= 1'b1;
frame_tick_o <= 1'b0;
end
else if (tick) begin
{vga_r, vga_g, vga_b} <= px_rgb;
vga_hs <= hs_n;
vga_vs <= vs_n;
frame_tick_o <= (hx == H_TOTAL - 1) && (vy == V_TOTAL - 1);
end
6'd14: font_row = (r == 3'd3) ? 8'hFF : (r == 3'd4) ? 8'hFF : 8'h00; // 横线
6'd15: font_row = 8'hFF; // 实心
6'd16:
font_row = (r == 3'd0) ? 8'h18 : (r == 3'd1) ? 8'h3C : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h66 : (r == 3'd4) ? 8'h7E : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h66 : 8'h00; // A
6'd17:
font_row = (r == 3'd0) ? 8'h7C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h7C : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h7C : 8'h00; // B
6'd18:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h60 :
(r == 3'd3) ? 8'h60 : (r == 3'd4) ? 8'h60 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h3C : 8'h00; // C
6'd19:
font_row = (r == 3'd0) ? 8'h78 : (r == 3'd1) ? 8'h6C : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h66 : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h6C :
(r == 3'd6) ? 8'h78 : 8'h00; // D
6'd20:
font_row = (r == 3'd0) ? 8'h7E : (r == 3'd1) ? 8'h60 : (r == 3'd2) ? 8'h60 :
(r == 3'd3) ? 8'h7C : (r == 3'd4) ? 8'h60 : (r == 3'd5) ? 8'h60 :
(r == 3'd6) ? 8'h7E : 8'h00; // E
6'd21:
font_row = (r == 3'd0) ? 8'h7E : (r == 3'd1) ? 8'h60 : (r == 3'd2) ? 8'h60 :
(r == 3'd3) ? 8'h7C : (r == 3'd4) ? 8'h60 : (r == 3'd5) ? 8'h60 :
(r == 3'd6) ? 8'h60 : 8'h00; // F
6'd22:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h60 :
(r == 3'd3) ? 8'h6E : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h3E : 8'h00; // G
6'd23:
font_row = (r == 3'd0) ? 8'h66 : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h7E : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h66 : 8'h00; // H
6'd24:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h18 : (r == 3'd2) ? 8'h18 :
(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h18 :
(r == 3'd6) ? 8'h3C : 8'h00; // I
6'd25:
font_row = (r == 3'd0) ? 8'h1E : (r == 3'd1) ? 8'h0C : (r == 3'd2) ? 8'h0C :
(r == 3'd3) ? 8'h0C : (r == 3'd4) ? 8'h0C : (r == 3'd5) ? 8'h6C :
(r == 3'd6) ? 8'h38 : 8'h00; // J
6'd26:
font_row = (r == 3'd0) ? 8'h66 : (r == 3'd1) ? 8'h6C : (r == 3'd2) ? 8'h78 :
(r == 3'd3) ? 8'h70 : (r == 3'd4) ? 8'h78 : (r == 3'd5) ? 8'h6C :
(r == 3'd6) ? 8'h66 : 8'h00; // K
6'd27:
font_row = (r == 3'd0) ? 8'h60 : (r == 3'd1) ? 8'h60 : (r == 3'd2) ? 8'h60 :
(r == 3'd3) ? 8'h60 : (r == 3'd4) ? 8'h60 : (r == 3'd5) ? 8'h60 :
(r == 3'd6) ? 8'h7E : 8'h00; // L
6'd28:
font_row = (r == 3'd0) ? 8'h63 : (r == 3'd1) ? 8'h77 : (r == 3'd2) ? 8'h7F :
(r == 3'd3) ? 8'h6B : (r == 3'd4) ? 8'h63 : (r == 3'd5) ? 8'h63 :
(r == 3'd6) ? 8'h63 : 8'h00; // M
6'd29:
font_row = (r == 3'd0) ? 8'h66 : (r == 3'd1) ? 8'h76 : (r == 3'd2) ? 8'h7E :
(r == 3'd3) ? 8'h6E : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h66 : 8'h00; // N
6'd30:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h66 : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h3C : 8'h00; // O
6'd31:
font_row = (r == 3'd0) ? 8'h7C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h7C : (r == 3'd4) ? 8'h60 : (r == 3'd5) ? 8'h60 :
(r == 3'd6) ? 8'h60 : 8'h00; // P
6'd32:
font_row = (r == 3'd0) ? 8'h3C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h66 : (r == 3'd4) ? 8'h6E : (r == 3'd5) ? 8'h3C :
(r == 3'd6) ? 8'h0E : 8'h00; // Q
6'd33:
font_row = (r == 3'd0) ? 8'h7C : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h7C : (r == 3'd4) ? 8'h78 : (r == 3'd5) ? 8'h6C :
(r == 3'd6) ? 8'h66 : 8'h00; // R
6'd34:
font_row = (r == 3'd0) ? 8'h3E : (r == 3'd1) ? 8'h60 : (r == 3'd2) ? 8'h60 :
(r == 3'd3) ? 8'h3C : (r == 3'd4) ? 8'h06 : (r == 3'd5) ? 8'h06 :
(r == 3'd6) ? 8'h7C : 8'h00; // S
6'd35:
font_row = (r == 3'd0) ? 8'h7E : (r == 3'd1) ? 8'h18 : (r == 3'd2) ? 8'h18 :
(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h18 :
(r == 3'd6) ? 8'h18 : 8'h00; // T
6'd36:
font_row = (r == 3'd0) ? 8'h66 : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h66 : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h3C : 8'h00; // U
6'd37:
font_row = (r == 3'd0) ? 8'h66 : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h66 :
(r == 3'd3) ? 8'h66 : (r == 3'd4) ? 8'h66 : (r == 3'd5) ? 8'h3C :
(r == 3'd6) ? 8'h18 : 8'h00; // V
6'd38:
font_row = (r == 3'd0) ? 8'h63 : (r == 3'd1) ? 8'h63 : (r == 3'd2) ? 8'h63 :
(r == 3'd3) ? 8'h6B : (r == 3'd4) ? 8'h7F : (r == 3'd5) ? 8'h77 :
(r == 3'd6) ? 8'h63 : 8'h00; // W
6'd39:
font_row = (r == 3'd0) ? 8'h66 : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h3C :
(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h3C : (r == 3'd5) ? 8'h66 :
(r == 3'd6) ? 8'h66 : 8'h00; // X
6'd40:
font_row = (r == 3'd0) ? 8'h66 : (r == 3'd1) ? 8'h66 : (r == 3'd2) ? 8'h3C :
(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h18 : (r == 3'd5) ? 8'h18 :
(r == 3'd6) ? 8'h18 : 8'h00; // Y
6'd41:
font_row = (r == 3'd0) ? 8'h7E : (r == 3'd1) ? 8'h06 : (r == 3'd2) ? 8'h0C :
(r == 3'd3) ? 8'h18 : (r == 3'd4) ? 8'h30 : (r == 3'd5) ? 8'h60 :
(r == 3'd6) ? 8'h7E : 8'h00; // Z
default: font_row = 8'h00;
endcase
end
endfunction
wire [7:0] frow = font_row(glyph, fy);
wire glyph_px = frow[3'd7-fx]; // 1 = 画字模点
// ---------------------------------------------------------------------------
// 光标框：黄色、常亮、2 像素宽
// 原来是 1 像素浅灰 + 闪动（blink 周期约 1.3 s）：在白色未揭开格上几乎看不清，
// 而且截图有一半概率正好截到"灭"的那个相位。改成黄色常亮 2 像素后，
// VGA 上和图里都能一眼看到指针。想改回闪动：把 blink_q 加回来，
// 再在 cursor_box 里与上 blink 即可。
// ---------------------------------------------------------------------------
wire cursor_here = (cursor_i[4:0] == ccol) && (cursor_i[12:8] == crow);
wire on_border = (hx[3:0] < 4'd2) || (hx[3:0] > 4'd13) || (vy[3:0] < 4'd2) || (vy[3:0] > 4'd13);
wire cursor_box = cursor_here && ctrl_i[0] && on_border;
// ---------------------------------------------------------------------------
// 颜色（3 位调色板 -> 4:4:4 RGB）
// ---------------------------------------------------------------------------
function [11:0] pal;
input [2:0] c;
begin
case (c)
3'd0: pal = {4'h0, 4'h0, 4'h0}; // 黑
3'd1: pal = {4'h0, 4'h0, 4'hA}; // 深蓝
3'd2: pal = {4'h0, 4'hA, 4'h0}; // 绿
3'd3: pal = {4'h0, 4'hA, 4'hA}; // 青
3'd4: pal = {4'hA, 4'h0, 4'h0}; // 红
3'd5: pal = {4'hA, 4'h0, 4'hA}; // 洋红
3'd6: pal = {4'hA, 4'hA, 4'h0}; // 黄
default: pal = {4'hA, 4'hA, 4'hA}; // 浅灰
endcase
end
endfunction
wire [ 2:0] px_color = glyph_px ? gcolor : bgcolor;
wire [ 2:0] px_final = cursor_box ? 3'd6 : px_color; // 6 = 黄，光标框
wire [11:0] px_rgb = de ? pal(px_final) : 12'h000;
always @(posedge clk or posedge reset) begin
if (reset) begin
{vga_r, vga_g, vga_b} <= 12'h000;
vga_hs <= 1'b1;
vga_vs <= 1'b1;
frame_tick_o <= 1'b0;
end else if (tick) begin
{vga_r, vga_g, vga_b} <= px_rgb;
vga_hs <= hs_n;
vga_vs <= vs_n;
frame_tick_o <= (hx == H_TOTAL - 1) && (vy == V_TOTAL - 1);
end
end
endmodule